BPA, Methylparaben Block Breast Cancer Drugs, California Pacific Medical Center Study

San Francisco researchers have discovered that two chemicals commonly used in consumer products - bisphenol A and methylparaben - can interfere with the effectiveness of drugs used to fight breast cancer. The research by doctors from California Pacific Medical Center in San Francisco is part of a growing body of evidence looking at the negative health effects of BPA, a plastic hardening chemical found in food containers, cans and even sales receipts, as well as methylparaben, a lesser-known preservative found in cosmetics and personal care products.